This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A262344 #81 Feb 16 2025 08:33:27 %S A262344 67,397,727,859,1321,2311,3037,3301,4159,8581,10891,12409,19471,28909, %T A262344 47059,51217,63559,64747,78541,79861,95107,100981,108571,119659, %U A262344 134707,139921,156157,177211,195427,203809,221101,257797,264991,284659,287167,294757,307627,315481 %N A262344 Centered 11-gonal (or hendecagonal) primes. %C A262344 Primes of the form (11*k^2 - 11*k + 2)/2. %H A262344 OEIS Wiki, <a href="https://oeis.org/wiki/Figurate_numbers">Figurate numbers</a> %H A262344 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CenteredPolygonalNumber.html">Centered Polygonal Number</a> %H A262344 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PrimeNumber.html">Prime Number</a> %p A262344 select(isprime, [(11*k^2-11*k+2)/2$k=1..300])[]; # _Alois P. Heinz_, May 27 2022 %o A262344 (PARI) for(n=1, 1e3, if(isprime(k=(11*n^2-11*n+2)/2), print1(k,", "))) \\ _Altug Alkan_, Nov 26 2015 %Y A262344 Intersection of A069125 and A000040. %K A262344 nonn %O A262344 1,1 %A A262344 _Ilya Gutkovskiy_, Nov 26 2015 %E A262344 a(15)=47059 inserted by _Georg Fischer_, May 27 2022